I have found what I think might be a bug, but I'm not sure.
It's easy to produce so I made this little mfa file.
If player 1 walking animation is playing and you move player 2 it interrupts players 1 walking animation.
It's the same the other way around.
Try holding the right or left arrow keys down, and then tap A or D to move player 2 and you can see it restarts the animation of the other player.
Is it a bug within Fusion, or is it just something I'm overlooking?.